НА САЙТЕ ВЕДУТСЯ РАБОТЫ. ВОЗМОЖНЫ СБОИ, НЕКОРРЕКТНОЕ ОТОБРАЖЕНИЕ.

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The information will be useful to repair brain ECU or a simplified understanding of the brain. Each of the active elements is numbered and has the annotation below. Strapping and passive elements I dont tell. This information relates to a P28 obd1 ECU boards, audit 02D01720-1500 (1720) A8Y-D, but on closer consideration you can see the analogy with other ECU line HONDA.

anatomy of a P28 OBD1 1720-1500

Anatomy P28 OBD1 1720-1500

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1. BARO Sensor, atmospheric pressure sensor

There is some USDM versions, an additional calculation factor of the fuel mixture. Measures atmospheric pressure. When the failure manifests itself as an error Check Engine 13.

BARO Sensor

BARO Sensor

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2. The group of resistors, manual transmission, automatic transmission

These resistors lift signal is used by CPU as working conditions automatic transmission. By changing the status, you can alter the automatic brain in a mechanical

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3. The group of the processor with external memory

Consists of the location of the memory chip housings DIP-28 and eight-bit storage register ( latch - latch). Label both chips face the connectors of the motherboard P28. As a resistor used logic 74 series 74HC373N as external memory uses CMOS chips 29C256, 27C256 or 27C512 (labeled from 0x008000h), or you can use the emulators memory. Jumper J1 is in the on state, is an indicator of the processor with external memory. Correct operation of the chip 70, 90, and 120 NS. Read more about Nintendo P28 can be read in a separate article.

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4. Service connector CN2

Present on most boards HONDA ECU in OBD1 is connected to terminals RX / TX UART processor. When you disconnect the jumper J12, all system information, necessary requests goes to CN2. Used to DataLog requires additional patch RTP in the firmware.

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5. The CPU OKI M66207-254

16 bit processor, the permanent memory 32 KB RAM 1 KB. Full name MSM66207 OKI Semiconuductor. Based on the architecture of the OLMs-66K (base core nX-8/300 nX-8/200). On Board is installed a quartz resonator 10 MHz (fastest operation). At this frequency, the execution time of the cycle is 400 NS. Guaranteed operation at temperatures of minus 55 plus 150 degrees Celsius. An ideal work is carried out at a temperature of plus 25,

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6. 74HC175N

Analogue КР1564ТМ8, trigger D-type x4 General reset with direct and inverse outputs. Logic.

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7. M82C55A

Full name MSM82C55A-2RS OKI produced Semiconuductor. Programmable peripheral interface data transfer or communication with the periphery. We can say that this extra CPU work with some sensors, to offload the main processor. Works with VTEC, automatic transmission, Knock, EGR

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8. Connector FC1

12 pin connector, in the brain P72 is used to connect the circuit Board shock sensor (Knock Sensor Board). In the minds of P1J and P1K created on the basis of P28 in this place there is a 10 pin connector for connecting circuit Board of the immobilizer.

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9. M7U016-005

Very little information about this chip, like another data interface to the main processor. Possible names OKI MSM7U0L6 MSM7U016

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10. M6434

OKI MSM6434, four bit processor, with 113 instructions. Many it is marketed as a \"spare processor\" as the main. The car really can make even if the main processor is in a read mode of the external memory and the chip in the crib there. A cursory analysis revealed that basically the processor is connected to the peripheral interface, and one of the contacts goes to the control solenoid, automatic transmission. Also the processor is connected to the jumpers J5, J4, J3. We know that when you install the VTEC whale on the brain P75 — set the jumpers J5 and J3.

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11. the scheme of testing injectors

Injector test circuit — required to check the integrity and efficiency of the injectors. may be completely absent. If such a scheme exists, the firmware is required, to prevent errors.

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    the
  • 02D011F0-1500 AY8-E (37820-P28-A02) is present
  • the
  • 02D011F0-1500 AY8-D (37820-P28-A01) is present
  • the
  • 02D011F0-1500 AY8-E (37820-P28-A52) is present
  • the
  • 02D01720-1500 A8Y-D (37820-P28-L51) is present
  • the
  • 02D01720-1500 A8Y-D (37820-P28-G51) is missing
  • the
  • 02D01720-1500 A8Y-D (37820-P28-G00) is missing
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12. jumper J12

As you now know to output information from the ECU to the computer an internal port CN2 (item 4) and one service connector DLC (D7), due to the fact that the standard flow of information can be intercepted via CN2, then after flashing RTP CUI (for example) Two streams of data will begin to interfere each other. that is why when you DataLog via CN2 J12 should be cut. Just want to say that if you are using an on-Board computer multitronics ri-500 when you turn on the DataLog and open J12 stops accepting data.

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13. D1779 IAT

NEC 2SD1779, NPN transistor. Connected by a manifold air temperature sensor in the intake manifold ( IAT) on D15. Necessary to measure the temperature at the sensor is replaced with a high resistance can burn. Very common failure.

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14. Voltage converters DC-DC

2 Board voltage conversion DC-DC, for distribution to the 12volt and 5 volts, respectively. have multiple channels. Marking NY1-C and NSW-B

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15. STA460C

Manufacturer SanKen. Two assemblies, 2 power NPN transistor. Is used to operate the injectors.

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16. STA413A

Manufacturer SanKen. 4 Assembly of the power NPN transistor, with slightly reduced settings. Used to operate the fuel relay and pin FLR.

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17. IC14 5050S

Sanken VTEC Switch. Powerful transistor to turn on the VTEC system. Use either the original SK5050 or its analogues : SK5151, iR6220 (need to swap 3 and 5 feet). In fact it is a field-effect transistor designed for 50V and 10 amps. Power dissipation 28 Wat. case To220-5

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18. IC 13 5050S

This transistor is needed, as if to disperse IC14. You can just delete it, but dont forget to set the jumper J10 &mdash. It is located between IC13 and IC14.

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19. Q21 IACV

Transistor IACV control valve, designated as Q21. Presumably MJE3055T

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20. Q31 EVAP (PCS)

Transistor control valve EVAP 2SD21780 or 2SD21780RACT-ND

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21. Automatic transmission IC15 5050S

two transistors on the inclusion of two solenoids of the automatic transmission. used the same transistors as for VTEC, so the owners P06 ECU-AUTO you can just resolder on IC15 IC14 and the extra transistor to give to a friend. in an automatic P28 uses a 4 transistor 5050S

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Данная статья актуальна для автомобилей Honda выпуска 1992-2000 годов, таких как Civic EJ9, Civic EK3, CIVIC EK2, CIVIC EK4 (частично). Информация будет актуальна для владельцев Honda Integra в кузовах DB6, DC1, с моторами ZC, D15B, D16A.

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